Lifting-jack



(No Model.) 1

R. JONES.

LIFTING JACK.

No. 355,173. Patented Dec. 28, 1886..

WITNESSES N. PETERS Phnlu-Lilhagnphen Walhinginn. D4 0.

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ROBERT J QNES, OF SHUQUALAK, MISSISSIPPI.

LlFTlNG-JACK.

SPECIFICATION forming part of Letters Patent No. 355.173, dated December 28. 1836.

Application fi'ed September E0, 1886. Serial No. 214,016. (No model.)

To all whom it may concern.-

Be it known that I, ROBERT J ONES, a citizen of the United States, and a resident of Shuqualak, inthe county of Noxubee and State of Mississippi, haveinvented certain new and useful Improvements in LiftingJacks; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification, and in which' Figure 1 is a perspective view of my improved lifting-jack. Fig. 2 is a vertical sectional View of the same. Fig. 3 is a top plan View ofthe jack, showing the pawl and ec-- centric lug upon the under side of the lever in dotted lines; and Fig. 4 is a bottom View showing the pawl and eccentric lug upon the upper side of the lever in dotted lines.

Similar letters of reference indicate corresponding parts in all the figures.

My invention has relation to that class of lifting-jacks in which two pawls upon a lever engage ratchet-wheels having the shoulders of the teeth facing in opposite directions, and secured upon a nut fitting upon the liftingscrew; and it consists in the improved construction and combination of parts of such a jack, as hereinafter more fully described and claimed.

In the accompanying drawings, the letter A indicates a cylindrical column having an axial bore, B, and a longitudinal slot, 0, extending from the lower end ofthe column to near the middle of the same into the axial bore. A screw, D, fits and slides freely within the axial bore, and is formed at its upper end with-a head, E, upon which the article to be raised may rest, while at the lower end the screw is provided with a laterally-projecting arm or stud, F, which projects out through the slot in the column and slides up and down in the same. A nut, G, fits upon the screw,

bearing with its under side against the upper end of the column, and the lower portion of the nut is formed with aratchet-rim, H,Whereupon follows a cylindrical port-ion, I, upon which the circular eye J of the lever K fits, whereupon the upper end of the nut is reduced and polygonal, and has the corresponding central aperture, L, of a ratchet-wheel,

and bearwith their free ends against the backs of the pawls, forcing them toward their respective ratchetwvheels. -A bolt, S, is journaled in the lever between the pivotal bolt of the pawls and the eye, with its rounded portion, and is provided at its upper end with a flat head, '1, andwith an eccentric cam, U, turning upon the upper side of the lever, and forcing the pawl out of engagement with the ratchet-wheel when forced against it, and the reduced shank V of a cam-block, WV, passes through the lower end of this bolt, the camblock projecting in the same direction as the eccentric cam upon the upper portion of the bolt.

It will now be seen that when it is desired to raise the screw the upper pawl is thrown out of engagement with the upper ratchetwheel, and the lower pawl will, by engaging the ratchet-wheel and by reciprocating the lever, turn the ratchet-wheel and nut, raising the screw. When it is desired to lower the screw, the upper pawl is thrown into engagement and the lower pawl out of engagement, and the nut maybe reversed by reciprocating the lever.

Railway-rails, or similar objects placed near to the ground, may be raised by forcing the laterally-projecting arm or lug upon the lower end of the screw under the rail or object, when the said object may be raised with the screw.

Having thus described my invention, I claim and desire to secure by Letters Patent of the United States I V In a lifting-jack, the' combination of a hollowcolumn formed with a longitudinal slot at the lower portion, a screw fitting in the hollow column, and having a head at its upper end and a laterally-projecting arm at the lower end projecting through the slot, a nut fitting upon the upper end of the screw and having a ratchet-rim upon its lower portion, and having a cylindrical portion above that 'IGO and an upper reduced and polygonal portion,

a ratchet-wheel fitting with its corresponding aperture upon the reduced portion of the nut, a lever having a circular eye fitting upon the cylindrical portion of the nut, spring-pawls engaging the ratchet-Wheels at opposite sides, pivoted upon the same bolt at the upper and under side of the lever, and a bolt j ournaled in the lever between the pivotal bolt and the eye, and having a flat head and an eccentric cam atits upper portion, and having a detachable camblock fitting with its reduced inner end in the lower end of the bolt projecting to the same side as the eccentric cam, as and for the purpose shown and set forth.

In testimony that I claim the foregoing as my own I have hereunto affixed my signature in presence of two witnesses.

' ROBERT JONES.

Witnesses: A. J. YARETZKY,

A. J. BosWELL. 

